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A variable is a named memory address in which a value may be stored and mutated.
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How do you know whether a relation is a function?
Use the definition of a function. If, for any value of one variable, there is only a single possible value of the second variable, then the second variable is a function of the first variable. The second variable is often called the "dependent variable". If you can solve an equation explicitly for the dependent variable, then it is a function. If you can NOT solve it for a variable, it may or may not be a function - it turns out that some equations are hard or impossible to solve explicitly for one of the variables.
How many zeros can you have in an algebraic function?
For an algebraic function in one variable, as many as the highest power of the variable.
What is another name for the output variable in a function?
Dependent variable
Describe how you can tell by looking at the graph of a function with variable is the input variable and which is the output variable?
You cannot.
What is radical function?
A function that has a variable under a radical sign.
